William was baptised 3/5 or 3/15/1809 at St. John's Church, Bermuda (Church Register) the same date as his brother John, leading to the assumption they were twins. This is verified by "Genealogy of the Denny family..." pg. 113.
A William Dunscomb aged seven, was buried in a service at Christ Church, Middletown, Ct. (now Church of the Holy Trinity) on 2/5/1816. The church records do not indicate the name of the parents, but his age corresponds with that of William Charles and in all probability they are the same person. (Letter from Sabdra Zajac (Church of the Holy Trinity) to Edward Andrew Dunscombe 1/25/1990 and papers of Frank Farnsworth Starr).
John Ziebarth (letter dated 5/3/1999) has his name as William John Dunscomb.